James Middleton was last seen on his light blue mobility scooter at around midday on July 2 (Image: Surrey Police)

The extended search follows a number of reported sightings of Mr Middleton, none of which have led to any concrete resolvement.

Detective Chief Inspector Mark Preston, who is leading the investigation, said: "As we approach the four-week anniversary of Mr Middleton’s disappearance, we’d like to extend our thanks to the volunteers who have given so much of their time to the numerous searches of the Ashtead Common area.

Search teams continue to scourer land to find James Middleton (Image: Surrey Police)

"The searches of Ashtead Common and Epsom Common have now been completed and we are now concentrating our search elsewhere.

"We urge anyone who may have seen Jim on July 2, or in the days and weeks since, to come forward with any information."

Mr Middleton was last seen travelling on a light blue mobility scooter (Image: Surrey Police)

Mr Middleton is described as white, 5ft 6 inches tall, of large build, with brown greying hair.

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He was last seen wearing a blue body warmer, dark grey shorts, blue trainers, white ankle socks and was riding his four-wheeled light blue mobility scooter.

If you have any information, please call 101 (999 in an emergency) and quote reference number P17165048.

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